Hoist



2,836,460 Patented May 27, 19 58 free HOIST Vernon J. Lundeil, Cherokee,Iowa Application October 14, 1955, Serial No. 540,384

2 Claims. (Cl. 298-22) My invention relates to a hoist.

An object of my invention is to provide a hoist for wagon boxesespecially, it being understood, however, that the hoist can be used onany pivotal arrangement.

A further object of my invention is to provide a hoist in which areciprocating piston is used in combination with a hydraulic cylinder,and which includes the very important feature that the thrust or effortof the hoist is doubled due to the fact that both the forward thrust ofthe piston rod as well as the rear thrust of the cylinder itself areutilized to provide the lifting action.

A further object of my invention is to provide a simple arrangementwhich can be readily installed.

With these and other objects in view, my invention consists in theconstruction, arrangement, and combination of the various parts of mydevice, whereby the objects contemplated are attained, as hereinaftermore fully set forth, pointed out in my claims, and illustrated in theaccompanying drawings, in which:

Figure 1 is a side elevation of the hoist, with portions thereof beingtaken in cross section,

Figure 2 is a plan view of Figure l, and

Figure 3 is a side elevation of the hoist in its fully raised position.

My invention contemplates the provision of a simple hoist which can bereadily attached to a wagon box lower structure for raising a pivotedwagon box, and by which the component forces of both ends of a hydraulicunit are employed to provide the lifting action, thereby providing ahigher lifting efficiency to the arrangement.

I have used the character to designate a U-shaped member which is placedover the transverse beam at the forward end of the wagon box, and whichbeam usually overlies the forward shaft, the character 11 indicatingthis beam.

Suitably hinged at 12 to the member 10 are a pair of rearwardlyextending members 13 having the downwardly inclined flanges 14 in whichflanges are provided the lengthened slots 15, and received in theseslots 15 is a transverse lengthened shaft or pin 16 which is rigidlyattached to a hydraulic oil cylinder 17 which is fed at 18.

Received within the cylinder 17 is a suitable piston which is secured tothe piston rod 19 which is attached to the member 20, which is securedto the transverse shaft 21, which shaft 21 is suitably journalled at 22to the spaced lifting arms 23. The arms 23 include the transverse shaft24 which is journalled in these arms, the shaft 24 being journalledwithin the brackets 25 which are attached to the wagon box itself.

Secured to the members 13 are the bearings 26 through which bearingspasses a shaft .27, this shaft 27 being securely welded to the arms 23.Also securely welded at 28 to the same shaft 27 are a pair of levers 29.The levers 29 include the short studs or pins 30 which are received inthe short slots 31, these slots being provided in the lengthened bars32, which bars are pivotally secured to the transverse pin 16.

The dotted line character 33 indicates .a wagon box which is to beraised, the apparatus being shown in a partially raised position, thelevers 29 being shown by dotted lines in the original or startingposition. The device operates in the following manner.

When it is desired to raise the wagon box, the oil under pressure is fedinto the cylinder 17 at 18, which causes the rod 19 to be thrust in thedirection of the arrow 34 to thereby start the raising action of theside members 23 which will pivot on the shaft 27. During thereciprocating action of the piston within the cylinder 17, since thetransverse pin 16 is not secured, it will travel toward the left, or inthe direction of the arrow 35 during this action, thereby pulling on thetwo rods 32 which in turn, due to the connection at 39, willcorrespondingly tend to draw the levers 29 toward the left. This actionwill have the tendency of causing the pivotal point 16 to change duringthe raising action so as to provide a greater efiort at the pivotingpoint 21 to increase the efficiency, espectially in the initial action.This action would not be true if the pivoting point 16 were fixed.

It will also be noted that at a certain point in the raising action, themembers 13 will also rise. The small slots 31 provide means whereby theraising action in the direction of the arrow 34 can be more rapid afterthe transverse pin 16 has reached its maximum limit to the left byvirtue of the fact that the levers 29 can travel further in an are afterthis limit has been reached, this action occurring when the wagon ispractically lifted to its full extent thereby speeding up the action atthis point where the maximum force is not required.

It should be specifically understood that slight changes or alterationscould be made in the various members and still involve the same generalprinciples.

It will now be seen that I have provided the advantages mentioned in theobjects of my invention with various other advantages being readilyapparent.

Some changes may be made in the construction and arrangement of theparts of my invention without departing from the real spirit and purposeof my invention, and it is my intention to cover by my claims anymodified forms of structure or use of mechanical equivalents which maybe reasonably included Within their scope.

I claim as my invention:

LA hoist comprising a pivotal member adapted to be pivotally attached toa framework portion of a wagon, a hydraulic cylinder, said pivotingmember having slots, a transverse pin attached to the base of saidhydraulic cylinder and received in said slots, bearings attached to saidpivoting member, a shaft journalled in said bearings, lifting armsrigidly attached to said shaft, a piston in said hydraulic cylinder, apiston rod attached to said piston, the end of said piston being pivotedto said lifting arms, levers rigidly attached to said shaft,lougitudinally extending bars pivotally attached to the ends of saidlevers and pivotally attached to said transverse pin, the forward endsof said lifting arms being pivotally secured to a forward portion of awagon box, expanding movement of said piston rod causing said liftingarms to raise, and said transverse pin to move in said slots.

2. A hoist comprising mounting means pivotally attached to a frameworkportion of a wagon, a hydraulic cylinder, a transverse pin attached tothe base of said hydraulic cylinder, bearings attached to said mountingmeans, a shaft journalled in said bearings, lifting arms rigidlyattached to said shaft, a piston in said hydraulic cylinder, a pistonrod attached to said piston, the end of said piston rod being pivoted tosaid lifting arms, levers rigidly attached to said shaft, longitudinallyextending bars pivotally attached to the ends of said levers andpivotally attached to said transverse pin, the forward ends 'of saidlifting arms being pivotally secured to a i A r 2,836,460

' movement c aiis ed by said? levgrs,

3 i Q 4 fg wagd portion ofisaid' wagon box, expanding movementReferences Cited in the file of this patent was pi tQQ. rQd qansmg saidlif .1g arms. o, miss ari said bars to move longitudinally, sans on saidmount- V UNITED STATES PATENTS 7 ing means operatively connected to saidpin for guiding 1,932,690 Clark Oct. 31, 1933 saicl'pina;*pr;@-dqtermi11d. distance; 'dill'ifigflhfi f fiif 5 2,691,244 SteinkeOct. 12, 1954 2,698,199 Godbersen Dec. 28, 1954

